Pencil sharpener



Nov. l2, 1929. H. COHEN' PENCIL SHARPENER Filed 0G17. 11. 1921 2 Sheets-Sheet "l AIl Nov. 12, 1929. H. conm,

PENCIL SHARPENER 2 Sheets-Sheet 2 Filed Oct. 11. 1921 Patented Nov. 12, 1929 UNITED STATES- HARRY COHEN, 0F WASHINGTON, DISTRICT OF COLUMBIA PENCIL SHARPENER Application filed. October 11, .1921. Serial No. 507,032.

Fig. 2 is a section on the line 2 2 of Fig. 1.

Fig. 3 is a vertical section of the pencil Sharpener showing a modification.

Fig. 4 is a section on the line 4 4 of Fig. 1. Fig. 5 is a section on the line 5-5'of Fig. 1. Fig. 6 is a detail part sectional view of the gear track and associated cutter. p

Fig. 7 is a detail View, partly in section, of the spring returning means; and Fig. 8 is a bottom plan view of the cutter ring.

Referring to the drawings, the numeral 1 designates an outer frame or casing provided with a helical groove 2 of suitable pitch. Mounted within the frame 1 is a vertically and rotatably movable member 3 provided with the helical rib 4 cooperating with the helical groove 2 in the casing 1. Restingon the ledge 5 in the upper end of the member 3 is an annular gear track member 6 having integral therewith the gear track 7 and pro- 'vided with the central opening 8. The gear track member 6 has a raised portion 9 provided on its under side with an annular channel 10 for a purpose to be described later. Depending from the top of the outer casing 1, which top may be integral with the body portion of the casing or detachably fixed thereto, are a plurality of lugs 11 extending into the hollow cylindrical members 12 which depend from the gear track member 6. As shown by the drawings, the lugs 11 are integral with the top of the casing 1 but it is obvious that they may be separable therefrom and detachably connected thereto. It is equally obvious that the cylinders 12 may be cast integral with the member 6 `or they may 50 be detchably connected thereto. Mounted at an angle to the plane of rotation of the carcooperation of the helical ribs 4 with the helithe bottom of the cylindrical members l2 is la' gear support 13 in which are journalled the spindles 14, 15 and 16 of the spur gears 17, 18 and 19 so that these spindles may freely rotate in said support 13. The member 3 is provided at its bottom with an annular internal gear 20 which meshes with thegears 18 and 19. The upper end of the spindle 14 has a squared portion 21 fitting int/o a recess in the carrier 22y so that when gears 18 and 19 rotate the gear 17, the carrier 22 is also rotated. Mounted inA the carrier 22 are the milling cutters 23 of a well known type with their axes disposed atV rier 22. The cutters 23 are, of course, ro- 1 tatably j ournalled in the carrier 22 so that as the cutters are carred around by the carrier 22 they may also rotate in the said carrier. Thelcutters 23 have bevel gears 24 meshing with the gear track 7 which is held from rotation bythe lugs 11, as will hereinafter be described. Secured to the spindles of the cutter 23 above their bevel gears is a ring 25 which fits into the channel 10 of the gear track member 6, the function of the said ring being to hold said cutters in the proper position as they are revolved by the carrier 22. This retaining ring 25 has two circular recesses 25a in which fit rotatably therein in an obvious manner the spindles 23a of the cutters 23, as shown in detail by Fig. 6.

As hereinbefore stated, the gear'track mem# ber 6 'is held from rotation by the lugs 11 and since thesupport 13 is 4fixed relative to the member 6, it is a parent that the lsupport 13 will likewise be libld from rotation. Thus, it is readily seen that as the member 3 is moved longitudinally it will rotate because of the cal groove 2 in the stationary casing l, and

as the member 3 rotates, its annular gear 20 meshes with the gears 18 and 19 impartingy rotation theretowhich in turn mesh with the smaller gear 17 and thereby rotate said gear 95 and the carrier 22. As the carrier 22 rotates,

the milling' cutters 23 revolve about a central axis and by reason of the meshing of the bevel gears with the gear track 7, the said cutters are caused to independently rotate in the carrier 22. These cutters 23 may be aptly described as planetary cutters.

It should be noted that the mechanism Within the casing 1, comprising the ribbed member 3, the gear track member 6, the gear support 13, the gears, the carrier 22 and the cutters 23, moves longitudinally as a unit` and at the same time the various parts revolve and rotate as required in order to produce. an' operative structure. nal movement of the members is resiliently restrained by the helical springs 26, one end of each spring being fixed to the lug 11 and vthe other end to the cylindrical members 12,

so that when the force that moves the mechanism is removed the springs will return the mechanism to its normal position near the top of the casino' l. In order to maintain the gear track memzber 6 in place on the ledge 5,

". there are provided a plurality of lingers 27 `Which are secured to the top of the member 3 by screws or other suitable means-and which overlap the member 6 holding it to the ledge 5 as re uired.

Fixe in the central opening 8 of the member 6` is a spring 29 of the form shown, disposed beneath opening 30, and as pressure is ing and thus the pencil is sharpened. The

use of the spring 29, While desirable, is not absolutely necessary as the push on the pencil imparted to the cutters will cause the necesi sary movement of the parts to cause the sharpening of the pencil. `To prevent the breaking of the point of the pencil as the pencil is pushed into contact with the cutters to secure the desired point length, there is provided in the carrier 22 a depression 31 to accommodate the pencil point. The shavings are caught in the removable pan l32 which may be emptied as it becomes necessary.

In Fig. 3, there is shown a modified form of cutter to indicate that various types of cutters maybe employed and that the invention does not contemplate the use of any s eciic cutter except as deined by the appen ed claims. Cutters 23 are tapered and have the ordinary gears 24: making the use of angularly arranged cutters and track gear unnecessary. The rest of the parts are the same as shown by Fig. 1 and the invention operates in the same Way.

It will of courseybe understood that the The longitudipitch of the helical rib 4 and the helical groove 2 and the diameters of the gears will be such as to produce the desired revolving and rotatin of the cutters. Particular attention is directed to the motiony multiplying mechanism, comprising the annular gear 20 and the vgears17, '18, and 19 so that the required number, of turns of the cutters is brought about by the predetermined longitudinal movement of the mechanism through the engagement of the gears as hereinbefore described.

For the sake of clarness, certain mechanical features have been deleted from the disclosure. For instance, it will be obvious that in order to reduce friction, ball bearings Will be employedand any skilled mechanic will provide such bearings and other friction reducing means Whenever it is found expedient to do so. The disclosure is such as to enable any person skilled in the art to make, construct and use the invention, but it should be understood that the disclosure is not intended to limit the invention to any particular form but the same may be embodied in other ways and changes in the form and construction may be made within the scope of the appended claims. i

Having now described my invention, what I desire to claim and secure by Letters Pat ent of the United States is:

1. A pencil Sharpener comprising rotating and revolving cutters, means for revolving said cutters and means for rotating said cutl ters operative upon a longitudinal movement thereof.

2. A pencil Sharpener comprising revolvingand rotatin cutters and longitudinally movable means or operating said cutters including speed-multiplying means.

3. A pencil Sharpener comprising revolvin and rotating cutters mounted in a longitutdinally and rotatably movable member and means for operating said cutters by saidA last mentioned member.

4. A pencil Sharpener embodying a stationary inverted cup-shaped member, a movable member normally near the top of said. cup shaped member, cutters associated with said movable member, elongated lugs. depending from the top of said stationary member, and helical springs associated with said lugs and with said movable member.

5. A pencil Sharpener embodying a stationary cylindrical member having a helical groove, a movable member having a rib cooperating With said helical groove to cause rotation of said movable member upon a longitudinal movement thereof, cutters associated with said movable member and longitudinally movable therewith and gearing between said movable member and said cutters Where by the rotation of said movable member causes rotation of said cutters.

6. A pencil Sharpener embodying a hollow" ters associated with said movable member and rotatably movable with relation thereto and motion multiplying means between said movable member and said cutters.

8. In a pencil sharpener, a planetary cutter, a longitudinally movable support therefor; and means for operating said planetary cutter operative upon movement of said support. v

9. In a pencil Sharpener, a planetary cutter,

a movable support therefor, spring means resiliently holding said support from movement, and means for operating said planetary cutter operative upon movement of said suport.

p 10. In a pencil sharpener, a planetary cutdescribed, a pair of sharpening elements engaging the pencil point on opposite sides, means for reciprocating them and means for simultaneously rotating them around the pencil point.

16. A pencil sharpener comprising a casing,

a frame mounted therein and spring supported i in a raised position, a cutter supporting base carried by the frame, means for imparting revoluble movement to the base upon-downward movement of the frame, divergin'g cutters on the revoluble base to rotate therewith, and means to impart revoluble movement'to the cutters themselves as the frame is depressed.

17. In a pencil sharpener, a casing provided with a 'tubular guide, a'base operatively l connecting with the tubular guide to impart movement to the base upon downward movement of the latter, a spring supported frame in the Casin and r'evolubly carrying the base, and f revolu le cutters dlverging upwardly from the base, and means to impart revoluble movement to thecuttersthemselves as *they swing around the end of the pencil upon downward movement of the frame.

In testimony whereof I affix mysignature.

' HARRY COHEN.

ter, a movable support therefor, means for operating said planetary cutter operative upon movementn of Said support, means iesponsive to pressure exerted on the pencil for moving said support in one direction and spring means for moving said support in the opposite direction.

11. In a pencil sharpener, a planetary cutter, a movable Support therefor, means for moving said support, and motion multiply` ing means between the means for moving the movable support and said movable support.

12. Apencilsharpenercomprisingaplanetary cutter, a movable support therefor, means responsive to pressure imparted to the pencil for moving said support, means operative upon movement of said support for operating Said cutter, and means resiliently resisting contact of the pencil with the cutter before the operation of the cutter.

13. A pencil vsharpener comprising a stationary member, a movable member, a planetary cutter associated with said movable member operative upon movement thereof, and spring means between said stationary and movable members.

14. A pencil sharpener comprising astationary member, alongitudinally movable member, a planetary cutter associated with said longitudinally movable member and opa erative upon movement thereof, and spring means between said stationary and longitudinally movable members.

c 15. In a pencil sharpener ofthe character 

